package com.itheima.test;

import com.itheima.domain.Student;

import java.util.ArrayList;
import java.util.Scanner;

public class StudentManager {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        ArrayList<Student> list = new ArrayList<>();
        lo:
        while (true) {
            System.out.println("--------欢迎来到学生管理系统--------");
            System.out.println("1 添加学生");
            System.out.println("2 删除学生");
            System.out.println("3 修改学生");
            System.out.println("4 查看学生");
            System.out.println("5 退出");
            System.out.println("请输入您的选择:");
            String choice = sc.next();
            switch (choice) {
                case "1":
                    addStudent(list);
                    break;
                case "2":
                    deleteStudent(list);
                    break;
                case "3":
                    updateStudent(list);
                    break;
                case "4":
                    queryStudent(list);
                    break;
                case "5":
                    System.out.println("感谢您的使用！");
                    break lo;
                default:
                    System.out.println("您的输入有误。");
            }
        }
    }

    public  static void deleteStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要删除信息的学生学号");
        String sid = sc.next();
        int index = getIndex(list, sid);
        if(index == -1){
            System.out.println("查无信息，请重新输入");
        }else{
            list.remove(index);
            System.out.println("删除成功！");
        }
    }

    public static void updateStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入您需要修改信息的学生学号");
        String sid = sc.next();
        int index = getIndex(list, sid);
        if(index == -1){
            System.out.println("查无信息，请重新输入");
        }else{
            System.out.println("请输入姓名");
            String name = sc.next();
            System.out.println("请输入年龄");
            int age = sc.nextInt();
            System.out.println("请输入生日");
            String birthday = sc.next();
            Student stu = new Student(sid,name,age,birthday);
            list.set(index,stu);
            System.out.println("修改成功！");
        }
    }

    public static void queryStudent(ArrayList<Student> list) {
        if (list.size() == 0) {
            System.out.println("暂无数据，请添加后重新查看！");
            return;
        }
        System.out.println("学号\t\t\t姓名\t\t年龄\t\t\t生日");
        for (int i = 0; i < list.size(); i++) {
            Student student = list.get(i);
            System.out.println(student.getSid() + "\t" + student.getName() + "\t\t" + student.getAge() + "\t\t" + student.getBirthday());
        }
    }
    public static void addStudent(ArrayList<Student> list) {
        String sid;
        Scanner sc = new Scanner(System.in);
        while(true){
            System.out.println("请输入学号");
            sid = sc.next();
            int index = getIndex(list, sid);
            if(index == -1){
                break;
            }else{
                System.out.println("您输入的学号重复，请重新输入");
            }
        }
        System.out.println("请输入姓名");
        String name = sc.next();
        System.out.println("请输入年龄");
        int age = sc.nextInt();
        System.out.println("请输入生日");
        String birthday = sc.next();
        Student student = new Student(sid, name, age, birthday);
        list.add(student);
        System.out.println("添加成功！");
    }


    public static int getIndex(ArrayList<Student> list, String sid) {
        int index = -1;
        for (int i = 0; i < list.size(); i++) {
            Student stu = list.get(i);
            String id = stu.getSid();
            if (id.equals(sid)) {
                index = i;
            }
        }
        return index;
    }
}